| Multiple stability attributes were declared on the same item. | |
| Erroneous code example: | |
| ```compile_fail,E0544 | |
| #![feature(staged_api)] | |
| #![allow(internal_features)] | |
| #![stable(since = "1.0.0", feature = "rust1")] | |
| #[stable(feature = "rust1", since = "1.0.0")] | |
| #[stable(feature = "test", since = "2.0.0")] // invalid | |
| fn foo() {} | |
| ``` | |
| To fix this issue, ensure that each item has at most one stability attribute. | |
| ``` | |
| #![feature(staged_api)] | |
| #![allow(internal_features)] | |
| #![stable(since = "1.0.0", feature = "rust1")] | |
| #[stable(feature = "test", since = "2.0.0")] // ok! | |
| fn foo() {} | |
| ``` | |
| See the [How Rust is Made and “Nightly Rust”][how-rust-made-nightly] appendix | |
| of the Book and the [Stability attributes][stability-attributes] section of the | |
| Rustc Dev Guide for more details. | |
| [how-rust-made-nightly]: https://doc.rust-lang.org/book/appendix-07-nightly-rust.html | |
| [stability-attributes]: https://rustc-dev-guide.rust-lang.org/stability.html |